About 35 years ago when the wife and I were dating we were sitting in her parents den one night watching tv. They had one of those little swinging dog doors cut in the back wall of the house for their poodle to come and go. All of a sudden the door swings up and in walks a possum, he stops looks up at us hangs a left walks over to the kitchen to the dogs food bowl eats all the dry kibble and walks back out. Don't believe it was his first time!